Free macOS app
ShrinkAgent 縮小担当
Drop images and they're instantly resized and saved.
No dialogs. No extra steps.
Features
Drag & drop — instant processing
Drop images or entire folders from Finder onto the window. Processing starts immediately, no dialogs needed.
Long-edge size presets
Choose from 640 / 800 / 1280 / 1920 / 2560 px presets, or enter any custom value from 10 to 30,000 px. Aspect ratio is preserved automatically.
JPEG quality slider
Fine-tune compression from 0–100%. Balance quality and file size to suit your workflow.
Output format selection
Keep original format, convert to JPEG, or PNG. Handles HEIC, TIFF, and WebP input too.
EXIF & GPS data stripping
Location and camera metadata are removed by default to protect privacy. Toggle on to preserve metadata when needed.
Multi-core parallel processing
Built on Swift Concurrency + TaskGroup to fully utilize all CPU cores. Handles large batches with ease.
Getting started
Download & unzip
Expand the ZIP to get ShrinkAgent.app.
Move to Applications
Drag ShrinkAgent.app to your Applications folder. That's all the installation needed.
Drop your images
Drag image files or folders onto the window — resizing starts instantly.
Supported formats
| Input | Output |
|---|---|
| JPEG, PNG, HEIC, TIFF, GIF, WebP | JPEG, PNG, HEIC, TIFF |
Note: WebP and GIF files saved as "Keep original" are automatically converted to JPEG.
Release history
- Fixed sequential numbering on filename collisions
- Improved color space preservation for TIFF output
- Initial release
Download for free
macOS 14 Sonoma or later · Developer ID signed · Free
Download (v1.0.3)
A freeware app developed and distributed by IT Niseko LLC.
Feedback and bug reports welcome via the contact form.